Kari, Matilainen
Jorma
Kari, Matilainen
Jorma
| 1. | Procedure for producing wood material sheets cut to size, in which a continuous raw board (2) is produced by pressing a mat of material by means of a continuously operating press (1), characterized in that the raw board (2) is divided in the lengthways direction into at least two component raw boards (3, 4) of desired width; each component raw board (3, 4) is cut into sheets (3', 4' ) of desired length. |
| 2. | Procedure as defined in claim 2, characterized in that the lengthways division of the raw board (2) is performed by sawing (5) . |
| 3. | Procedure as defined in claim 1 or 2, characterized in that the crosscutting of the. component raw board (3, 4) is performed by sawing (6, 7) . |
| 4. | Procedure as defined in any one of claims 1 3, characterized in that, at least at the crosscutting stage, the component raw boards {3, 4) are brought to different levels in the cutting area. |
| 5. | Procedure as defined in any one of claims 1 4, characterized in that the crosscutting of the component raw boards (3, 4) is performed using a device (6, 7) known in itself, designed for the cutting of moving material, e.g. a FCC saw or the like. |
| 6. | Procedure as defined in any one of claims 1 6, characterized in that the crosscutting (6, 7) of adjacent component raw boards (3, 4) is performed from opposite sides of the sheet level. |
| 7. | Procedure as defined in any one of claims 1 6, characterized in that the crosscut line (9, 10) of each component raw board (3, 4) is independent of the crosscut line (9, 10) of the other component raw boards. |
| 8. | Procedure as defined in any one of claims 1 7, characterized in that each component raw board (3, 4) is crosscut by means of a separate crosscutting apparatus (6, 7) . |
The present invention relates to a procedure as defined in the preamble of claim 1.
In prior art, solutions are known in which so-called master sheets (e.g. 8 x 16 ft. or 9 x 20 ft.) are first produced by crosscutting from a pressed raw board obtained from a continuous press line and the master sheets are further cut to size using a separate saw. Such a method requires relatively expensive investments on equipment. In addition, it involves high operating costs. The method is too complicated and expensive especially in cases where only certain standard sizes are needed as end product {e.g. 4 x 8 ft. or 5 x 9 ft.) .
Further, there are solutions in which so-called master sheets (e.g. 8 x 16 ft. or 10 x 18 ft.) are produced from a raw board on a press line by crosscutting and then sawing them lengthways by means of a long saw provided on the press line before the stacking stage. A drawback with this method is inflexibility especially in cases where two or more sheet sizes, especially sheet lengths, are to be obtained as end product.
The purpose of the present invention is to avoid the drawbacks of prior art and to achieve a simple and substantially more flexible procedure for producing cut- to-size sheets on a press line.
The invention is characterized by what is said in the claims.
The procedure of the invention has numerous significant advantages. It allows flexible production of several sheet sizes, because a desired length can be selected
for each component raw board.
For instance, when the press width is 9 ft., it is possible to produce e.g. sheet sizes 4 x 16 ft. and 5 x 18 ft. at the same time.
In the following, the invention is described by the aid of an example by referring to the attached drawings, in which
Fig. 1 presents an apparatus applying a procedure according to the invention,
Fig. 2 presents a diagram representing the procedure of the invention.
In the procedure of the invention, a mixture of wood material and binding agent is pressed in a press 1 to produce a raw board 2, which is conveyed on a carrier 11, such as a roller track, in the direction indicated by the arrow. The raw board 2 is divided into at least two component raw boards 3, 4, preferably by sawing 5. In the case illustrated by the figures, the raw board is divided into two component raw boards. The component raw boards 3, 4 may differ from each other in respect of width. The blade of the long saw 5 is preferably adjustable in the lateral direction, permitting the widths of the component raw boards to be quickly changed. The long saw 5 may have several blades, depending on the number of component raw boards. Alternatively, it is possible to use several successive long saws.
After the lengthways division sawing, the component raw boards 3, 4 are cut into sheets 3' , 4' of a given size,
preferably separately. For this purpose, typically a separate cutting device 6, 7, preferably a saw, is provided for each component raw board. The saw 6, 7 used for the crosscutting may be a so-called crosscut saw for moving material, known in itself, such as e.g. the Sunds Defibrator FCC (Flying Cross-Cutting Saw) . To facilitate the crosscutting operation, at least adjacent component raw boards 3, 4 can be brought to different levels at least in the cutting area. This can be implemented e.g. by raising or lowering the height position of at least one of the supports 12, 13 carrying adjacent component raw boards 3, 4 at least partially in relation to the support 12, 13 carrying the adjoining component raw board.
The cutting apparatus 6, 7 is typically equipped with a circular saw, which may be of a type sawing from above or a type sawing from below with respect to the level of the component raw board 3, 4.
The sheets 3', 4' of desired size produced by crosscutting the component raw boards 3, 4 are moved on e.g. by means of conveyors 14, 15 to a further treatment stage, such as a stacking stage.
It is obvious to a person skilled in the art that the invention is not limited to the embodiments described above, but that it can be varied within the scope of the following claims.